Abstract：As an active exploration, the triple active bridge (TAB) has been widely concerned in the fields of distributed photovoltaic access, new energy vehicles, and multi-voltage level DC power demand. Soft switching is one of the key advantages of TAB, which can effectively reduce switching loss and improve conversion efficiency. However, due to the increase in the number of switches, the working mode and phase shift control method of TAB have multiplied compared with the dual active bridge (DAB), and the existing ZVS method of DAB is not applicable to TAB. Based on the analysis of TAB working principle, the equivalent circuit of TAB is decomposed from switching signals, and the uniform expression of the inductor current under dual-power supply is constructed. According to the superposition theorem, the inductor current at the opening time of certain switch can be obtained by adding the inductor current under multiple dual-power supplies. Moreover, it is not affected by the phase shift method, and the calculation is simple. Based on the decomposition circuit model, this paper draws and analyzes the ZVS region of TAB under different phase shift control methods. Finally, an experimental platform is built to verify the feasibility and effectiveness of the proposed method.
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2021, Vol. 36 
